With the side sewer line installed and buried, it's time to focus on the foundation of the house. There's quite a bit that goes into creating it. The first step was to flatten and compact the ground. Next, the plumber installed the sewer pipes that lead to all the drains in the house.
After that, they brought in and compacted a 12" layer of gravel across the entire surface. This is to add stability and proper drainage to the ground.
While I was on site, I saw them prepare for the next step:
They're unloading 2" rigid foam panels. Those will be laid across the entire surface of the gravel in order to insulate the foundation from the ground. This will prevent heat from escaping the house through the foundation and will make the bottom floor seem more like a normal room, unlike a typical cold basement.
That truck also has a bunch of rebar. This will be installed above the foam layer to help strengthen the 8" thick concrete slab.